tenseness (the characteristic of being tense) / tension (psychological state of being tense) / tension (state of an elastic object which is stretched in a way which increases its length) / stress (the internal distribution of force per unit area) / tension; voltage / a situation where conflict between social groups is imminent / tenseness (a particular vowel or consonant quality) / tenson (debate between two interlocutors)

(physics) surface tension (effect on the surface of a liquid that makes it behave as a stretched elastic membrane)